The ADHD diagnosis should get her testing accommodations. The CogAT is *not* ADHD friendly, as getting a good score depends not only on knowing the right answers, but also on speed. It also has a low ceiling, so if she was tested at grade level, just a few silly mistakes will knock down the percentile rank considerably. If she doesn't already have testing accommodations with a 504 or IEP, I would work on getting those in place ASAP and then insist on a retest. It should be untimed and at least one level up, preferably two.
